Alert reader Phoenixwoman writes:
For one thing, the lettering and numbering isn’t in Farsi (the language used by Iranians); for another, the UK uses 81MM shells, and Iran would be much more likely to use Soviet-style 82MM shells.
In addition: As a commenter at NewsHog noted, the UK uses shells of that type, so there’s a strong likelihood that this was grabbed out of a Brit ammo dump in Iraq, given a cursory rebranding, and then ‘found’ in an insurgents’ den.
Fakes? Say it isn’t so!